Figure 3-4: Remote Probe Connections; Figure 3-5: Fet Series Resistance - Teledyne 2000RS Operating Instructions Manual

Installation
Remote Valve Connections: The standard analyzer is a single
chassis instrument with no internal control valves. Instead, the Remote
Valve connections are used as a method for directly controlling external
sample/zero/span gas valves. See Figure 3-4.

Figure 3-4: Remote Probe Connections

The voltage from these outputs is nominally 0 V for the OFF and
24 VDC for the ON conditions. The maximum combined current that
can be pulled from these output lines is 100 mA. (If two lines are ON at
the same time, each must be limited to 50 mA, etc.) If more current
and/or a different voltage is required, use a relay, power amplifier, or
other matching circuitry to provide the actual driving current.
In addition, each individual line has a series FET with a nominal
ON resistance of 5 ohms (9 ohms worst case). This can limit the
obtainable voltage, depending on the load impedance applied. See
Figure 3-5.
Teledyne Analytical Instruments

Figure 3-5: FET Series Resistance

2000RS
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